I hardly get 4G and I heard it uses battery constantly checking if 4G is there? Is that true? Yes, but guess what: 3G does the exact same. Best thing: disable both 3G and 4G when you're near wifi, or don't use data, or have a bad signal... Killing 3G/4G has a massive impact on battery life. On some devices you can double your standby and usage time especially when reception is poor or absent